I've been running Shimano IG and HG series chains (6-7-8-speed) on my C&V Campy bikes and the performance is great - smooth, quiet shifts. Problem I have had is stiff links. When I opened up a stiff joint and looked at the inside of the plates where they rub together, I found what appeared to be rust that was locking up the joint. Odd because the chains appear to be stainless steel or chrome or nickel plated. I don't ride in wet or salty conditions and I keep my chains lightly lubed. I'm still using the Shimanos, but lubing them more and replacing them more often, discarding rather than cleaning them.
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My C&V Bikes:
1972 Bottecchia Professional, 1972 Legnano Olympiade Record,
1982 Colnago Super, 1987 Bottecchia Team C-Record,
1988 Pinarello Montello, 1990 Masi Nuova Strada Super Record,
1995 Bianchi Campione d'Italia, 1995 DeBernardi Thron